# Unify

This command generates a grammar file that contains one or more combined entities.

A combined entity is a single entity that combines the patterns for a predetermined set of entities.

Eduction can find matches for a combined entity faster than it can find matches for the equivalent list of source entities, because in the combined entity the list of patterns is optimized as a single unit.

Eduction automatically returns matches using the source entity names, so you do not lose any information about which entity produced a match.

The following table describes the parameters for this command.

`-l <licensefile>` | The file containing a valid license key for Eduction. If you do not specify a license key, edktool attempts to load the license `licensekey.dat` in its current working directory. You must specify the license parameter if your license is in a different location.
`-g <grammarfile>` | A comma-separated list of grammar files that contain the source entities to combine.
`-e <entity>` | The definition for a combined entity, in the form: `combined-name=source-name1,source-name2,...` If you want to create more than one combined entity you can use the `-e` parameter multiple times.
`-o <outputfile>` | The output grammar file.

## Examples

The following example creates a grammar file named `custom.ecr` that contains an entity named `pii/address/custom`, by combining the address entities for France and Germany.

`edktool unify -o custom.ecr -g address.ecr -e pii/address/custom=pii/address/fr,pii/address/de`

You can create more than one combined entity by passing the `-e` parameter multiple times.

`edktool unify -o custom.ecr -g address.ecr,telephone.ecr -e pii/address/custom=pii/address/fr,pii/address/de -e pii/telephone/context/custom=pii/telephone/context/fr,pii/telephone/context/de`

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